#include <stdio.h>

//int main()
{
    unsigned char i = 0;
    for(i = 0; i <= 255; i++)//无限循环
    {
        printf("hello world\n");
    }
    return 0;
}

//int main()
{
    unsigned int i;
    for(i = 9; i >= 0; i--)
    {
        printf("%u\n", i);
        Sleep(1000);
    }
    return 0;
}

int main()//x86环境，小端字节序
{
    int a[4] = {1, 2, 3, 4};
    int* ptr1 = (int*)(&a + 1);
    int* ptr2 = (int*)((int)a + 1);
    printf("%x,%x", ptr1[-1], *ptr2);
}